Superboy in "The Boy in the Lead Mask"
A crooked professor gets an entire class of Smallville students to wear lead masks to try and learn which of them is secretly Superboy.
Also it's revealed that Superboy has a secret cavern room inside a giant boulder.
Aquaman in "The Return of Captain Flint"
Johnny Quick in "Johnny Quick Meets Deadshot Dudley"
An untitled Shorty strip.
"Kicking the Calender Around"
Green Arrow in "The Ape with the Human Brain"